Background: As part of our migration process from Configuration Manager 2007 to Configuration Manager 2012 R2 we also adjust the App-V Cache Size that is currently set to 6GB to 11GB because the ConfigMgr Agent Cache is set to 10GB, this by following the best practice described in Microsoft’s whitepaper Virtual Application Management with Microsoft Application Virtualization 4.5/4.6 and System Center Configuration Manager 2007 R2 where it says.
“The App-V Client cache free disk space threshold parameter should be set to ensure that the available disk space on the client PC is at least 1 GB larger than the Configuration Manager Client cache size.”
The actual change of the App-V cache is not done through PowerShell itself but set using the Microsoft appvcachesize.exe utility. I used this utility based on the explanations provided in the blog post from Kirx About the App-V Client Cache size not being (fully) controlled by the Registry Value FileSize
Because I am getting a lot from the community, I wanted to give something back and therefore created a standalone script of the code that changes the App-V Cache size that i have embedded in our larger ConfigMgr migration script which I might share at a later point in time.
The below script Set’-AppVCacheSize.ps1 dos the following.
- Copies the appvcachesize.exe to the targeted remote machine
- Retrieves the current App’-V Cache file and size settings
- Changes the App-V Cache size to the size specified
- Displays the new App-V Cache file and size settings
Important! You must store the appvcachesize.exe within the same folder where the PowerShell script is stored.
Also note that the script is using PowerShell remoting for all actions, so having WinRM enabled on the target machines is a must.
Examples of possible execution modes are documented within the Script.
<#
.Synopsis
Configure the App-v 4.6X Cache Size
.DESCRIPTION
Configure the App-V 4.6x Cache size on the specified computers using the AppvCachesize.exe
Utility from Microsoft
.PARAMETER Computername
Array of strings that represents the remote computeres to target
.PARAMETER Size
The App-v Cache Size in MB
.PARAMETER Showonly
Only Shows the Current App-V Cache Size but does not change anything
.EXAMPLE
Set-AppVCacheSize -Computer TestClient01 -Size 11000
.EXMAPLE
Set-AppvCacheSize -Computer TestClient01 -Showonly
.NOTES
Version 1.0, Alex Verboon
#>
[CmdletBinding()]
Param (
[Parameter(Mandatory=$True,
ValueFromPipeline=$true,
ValueFromPipelineByPropertyName=$true,
HelpMessage= 'One or more computer names')]
[Alias('Host','ipaddress')]
[String[]]$ComputerName,
[Parameter(Mandatory=$False,
ValueFromPipeline=$true,
ValueFromPipelineByPropertyName=$true,
HelpMessage= 'Specify the new App-V Cache size in MB')]
[String]$Size,
[switch]$Showonly
)
Begin{
$scriptPath = split-path -parent $MyInvocation.MyCommand.Definition
if ($Showonly -eq $false -and [string]::IsNullOrEmpty($Size))
{
write-output "You must specify the -Size parameter or -Showonly"
Exit 0
}
Function Send-File {
##############################################################################
##
## Send-File
##
## From Windows PowerShell Cookbook (O'Reilly)
## by Lee Holmes (http://www.leeholmes.com/guide)
##
## http://www.powershellcookbook.com/recipe/ISfp/program-transfer-a-file-to-a-remote-computer
##############################################################################
<#
.SYNOPSIS
Sends a file to a remote session.
.EXAMPLE
PS >$session = New-PsSession leeholmes1c23
PS >Send-File c:\temp\test.exe c:\temp\test.exe $session
#>
param(
## The path on the local computer
[Parameter(Mandatory = $true)]
$Source,
## The target path on the remote computer
[Parameter(Mandatory = $true)]
$Destination,
## The session that represents the remote computer
[Parameter(Mandatory = $true)]
[System.Management.Automation.Runspaces.PSSession] $Session
)
Set-StrictMode -Version Latest
## Get the source file, and then get its content
$sourcePath = (Resolve-Path $source).Path
$sourceBytes = [IO.File]::ReadAllBytes($sourcePath)
$streamChunks = @()
## Now break it into chunks to stream
Write-Progress -Activity "Sending $Source" -Status "Preparing file"
$streamSize = 1MB
for($position = 0; $position -lt $sourceBytes.Length;
$position += $streamSize)
{
$remaining = $sourceBytes.Length - $position
$remaining = [Math]::Min($remaining, $streamSize)
$nextChunk = New-Object byte[] $remaining
[Array]::Copy($sourcebytes, $position, $nextChunk, 0, $remaining)
$streamChunks += ,$nextChunk
}
$remoteScript = {
param($destination, $length)
## Convert the destination path to a full filesytem path (to support
## relative paths)
$Destination = $executionContext.SessionState.`
Path.GetUnresolvedProviderPathFromPSPath($Destination)
## Create a new array to hold the file content
$destBytes = New-Object byte[] $length
$position = 0
## Go through the input, and fill in the new array of file content
foreach($chunk in $input)
{
Write-Progress -Activity "Writing $Destination" `
-Status "Sending file" `
-PercentComplete ($position / $length * 100)
[GC]::Collect()
[Array]::Copy($chunk, 0, $destBytes, $position, $chunk.Length)
$position += $chunk.Length
}
## Write the content to the new file
[IO.File]::WriteAllBytes($destination, $destBytes)
## Show the result
Get-Item $destination
[GC]::Collect()
}
## Stream the chunks into the remote script
$streamChunks | Invoke-Command -Session $session $remoteScript `
-ArgumentList $destination,$sourceBytes.Length
}
### End of Send-File function
Function Set-AppVSize($Size,$Showonly)
{
$AppVCache = Get-ItemProperty "HKLM:SOFTWARE\Wow6432Node\Microsoft\SoftGrid\4.5\Client\AppFS"
$AppvCacheFile = $AppVCache.FileName
$AppVCacheFileSize = (Get-ItemProperty -Path "$AppvCacheFile").Length /1gb
$AppvCacheSize = $AppVCache.FileSize
$Prop = [ordered]@{
"AppvCachefile" = $AppvCacheFile
"AppVCacheFileSize" = $AppvCacheFileSize
"AppVCacheSize" = $AppvCacheSize
}
$Obj1=New-Object -TypeName PSObject -Property $Prop
$obj1 | Select-Object AppvCacheFile, AppVCacheFileSize, AppVCacheSize | format-list
if ($Showonly -eq $False)
{
# set Eula acceptance in registry, required to run the Microsoft AppVCacheSize.exe
# http://www.microsoft.com/en-us/download/details.aspx?id=5927
New-Item -Path "Registry::HKCU\Software\Microsoft\AppVTools" -ErrorAction SilentlyContinue
New-Item -Path "Registry::HKCU\Software\Microsoft\AppVTools\CacheSizeTool" -ErrorAction SilentlyContinue
New-ItemProperty -Path "Registry::HKCU\Software\Microsoft\AppVTools\CacheSizeTool" -Name "EulaAccepted" -PropertyType "dword" -Value "1" -ErrorAction SilentlyContinue
#Set the App-V Cache Size
Write-output "Configuring App-V Cache Size to $Size"
$cmd = "C:\WINDOWS\temp\AppVCacheSize.exe"
$arg = "/s:" + "$size"
Start-Process -FilePath $cmd -ArgumentList $arg
Start-Sleep -Seconds 5
# Get updated App-V Cache size information
$AppVCache = Get-ItemProperty "HKLM:SOFTWARE\Wow6432Node\Microsoft\SoftGrid\4.5\Client\AppFS"
$AppvCacheFile = $AppVCache.FileName
$AppVCacheFileSize = (Get-ItemProperty -Path "$AppvCacheFile").Length /1gb
$NewAppvCacheSize = $AppVCache.FileSize
$Prop = [ordered]@{
"AppvCachefile" = $AppvCacheFile
"AppVCacheFileSize" = $AppvCacheFileSize
"AppVCacheSize" = $NewAppvCacheSize
}
$Obj1=New-Object -TypeName PSObject -Property $Prop
$obj1 | Select-Object AppvCacheFile, AppVCacheFileSize, AppVCacheSize | format-list
}
} # end set appv-size
} #end begin
# -------------------------------------------------------------------------------------------
# Process AppVCacheSize Cache setting
# -------------------------------------------------------------------------------------------
Process
{
ForEach($c in $ComputerName)
{
$session = New-PSSession -ComputerName $c
write-output "Processing: $c"
If ($Showonly -ne $True)
{
Send-file "$scriptPath\appvcachesize.exe" "C:\Windows\temp\appvcachesize.exe" $session
}
Invoke-Command -Session $session -ScriptBlock ${function:Set-AppvSize} -ArgumentList $Size,$Showonly -Verbose
Remove-PSSession $session
}
}
End{
}